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Identifier 000402474
Title Imaging in random waveguides
Alternative Title Απεικόνιση σε τυχαίους κυματοδηγούς
Author Καρασμάνη, Ευτυχία
Thesis advisor Τσόγκα, Χρυσούλα
Reviewer Liliana, Borcea
Γιώργος, Μακράκης
Abstract We consider the problem of imaging one or more sources in a two-dimensional waveguide with horizontal flat boundaries and random sound speed fluctua- tions. Our data is the acoustic pressure field, measured on a vertical array of hydrophones that may span the entire depth of the waveguide or a part of it. We use randomness to model the effect of internal waves on the sound channel. Although the strength of the fluctuations is small, the transmitted signal is significantly affected from the multiple scattering of the waves with the random inhomogeneities, especially since we consider large propagation distances between the sources and the receiver array. Imaging is performed following an incoherent approach relying on a transport system of equations that describes wave propagation in random waveguides and that takes into account modal dispersion and energy transfer between modes.
Language English
Subject Source localization
Εντοπισμός πηγής
Issue date 2016-07-22
Collection   School/Department--School of Sciences and Engineering--Department of Applied Mathematics--Doctoral theses
  Type of Work--Doctoral theses
Permanent Link https://elocus.lib.uoc.gr//dlib/2/f/f/metadata-dlib-1469530003-309221-25560.tkl Bookmark and Share
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